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This Ferrea single spring kit targets the Honda Type‑R K20C1 turbo and is supplied as a single‑spring replacement package; the listing notes that RR1006 is required for proper installation. It provides the specific spring components intended for K20C1 Type‑R turbo valvetrain service where the RR1006 item is used alongside the springs.
Ferrea Honda Type-R K20C1 Turbo Single Spring Kit (Requires RR1006)
